Seventeen-year-old girl Zhang Biyu is born to a well-off family but feels depressed. Biyu’s father is always busy off supporting the family’s economy. Biyu’s mother is addicted to playing mahjong. Both of Biyu’s parents don’t make time for her, Biyu’s brother is also too young, so Biyu has no one to talk to. At school, most of Biyu’s classmates have already have lovers, which makes Biyu feel lonely. Frustrated, Biyu starts having a crush on her teacher.